Method for manufacturing steel sheet for cold press and method for manufacturing press component

A method for manufacturing a steel sheet, the method comprising:

• a shearing step of subjecting at least a portion of an edge of the steel sheet to shearing;
• an analysis step of determining, within the edge of the steel sheet subjected to shearing in the shearing step, a region where it is estimated that a stretch flange crack is likely to occur when the steel sheet is formed by cold pressing, wherein the region is specified through examination by computer-aided engineering (CAE) analysis using a computer based on conditions for the cold pressing, and
• a heating and cooling step of heating, within the edge of the steel sheet, a site included in the region determined in the analysis step to a temperature within a heating temperature range preset according to a microstructural composition of the steel sheet and cooling the site, wherein
• when the microstructural composition of the steel sheet is composed of a) 98 vol % or more of martensite, the heating temperature range is 500° C. or more and 700° C. or less;
• b) a composite microstructure of martensite and ferrite having:
• less than 95 vol % of martensite, less than 3 vol % of phases other than ferrite including residual austenite, and the rest being ferrite, the heating temperature range is 400° C. or more and 700° C. or less;
• c) 98 vol % or more of bainite, the heating temperature range is 400° C. or more and 700° C. or less;
• d) 98 vol % or more of ferrite, the heating temperature range is 400° C. or more and 700° C. or less;
• e) a composite microstructure of ferrite and pearlite wherein a sum of phase fractions of a ferrite phase and a pearlite phase is 98% or more and a phase fraction of the pearlite phase is 5% or more, the heating temperature range is 400° C. or more and 700° C. or less;
• and f) a composite microstructure having 3 vol % or more of residual austenite, the heating temperature range is 200° C. or more and 700° C. or less.